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Pressure Signs
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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scratcherky
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Joined: Jan 29, 2005
Posts: 15
Location: Bluegrass State

PostPosted: Sat Jul 22, 2006 4:48 pm    Post subject: Pressure Signs Reply with quote

Confused I am aware of too high pressure signs but I would like to know if there are any recognizeable signs of too low pressure. I am referring to bottle neck rifle rounds.
Thanks,
Don
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PaulS
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Joined: Feb 18, 2006
Posts: 3334
Location: South-Eastern Washington - the State

PostPosted: Sat Jul 22, 2006 6:47 pm    Post subject: Re: Pressure Signs Reply with quote

Lets see, dangerously low pressure signs would include:
primer prodruding from the base of the shell but still tight.
Black soot covering the case from the mouth toward the base. It might just be the neck and shoulder but it could go halfway down the case.
bullets stuck in the barrel - this one might not be readily noticed until you fire the next shot which will of course put a large bulge or logitudinal split in your barrel.
Squib loads - where the powder is pushed with the bullet into the barrel but does not burn.
Detonation - similar to the squib load but the powder stay lit and burns from several points slowly until everything comes to rest and then explodes with enough pressure that your case is destroyed and your gun could be as well.

I think that covers just about everything - at least all that my old brain can remember right now.

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scratcherky
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PostPosted: Sun Jul 23, 2006 6:27 am    Post subject: Re: Pressure Signs Reply with quote

PaulS Thanks for the info. I do not think I have dangerously low pressure but on occasion I get some black soot on the case neck only about half way to the shoulder. Is this normal or does this indicate that the pressure should be increased some. I see this mainly when starting to work up a load using the low range of powder from reloading manuals.

Thanks,
Don
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Spacedone
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PostPosted: Sun Jul 23, 2006 8:16 am    Post subject: Re: Pressure Signs Reply with quote

be sure to use a acceptable powder for the min loading.

rule of thumb is if the powder doesnt fill more than half the case then your using the wrong powder.

optimum is where the powder for the FPS your wanting almost completely fills the case but not enough to make you compress the charge.

saving pennies by scrimping on powder can be dangerous.

to low of pressure IS MORE dangerous than to much.

a gun designed to taqke 60,000 psi actually is rated at like 80,000 psi.

to little pressure can make a detonation which may exceed the guns tolerance.
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ares
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Location: Czech Republic

PostPosted: Sun Jul 23, 2006 9:11 am    Post subject: Re: Pressure Signs Reply with quote

I think, that this is what Scratcherky thought:

sweb.cz/Ares79/lowpres/neck1.jpg
sweb.cz/Ares79/lowpres/neck2.jpg

Is that something black on the neck a sign of low pressure?
In the case there is 45,5gr of Tubal 7000 powder, so between the powder and bullet there are about 5mm of free space. The case is 7,62x54R
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scratcherky
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PostPosted: Sun Jul 23, 2006 9:57 am    Post subject: Re: Pressure Signs Reply with quote

ares your first pic is what I was referring to only not as much soot and only about half way up the neck.
I choose a powder to try for about 85% of case capacity and never where there is a chance of a double load.
Thanks,
Don

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ares
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PostPosted: Sun Jul 23, 2006 10:00 am    Post subject: Re: Pressure Signs Reply with quote

I think, that I have to use a faster powder
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Dimitri
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Joined: Nov 25, 2005
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Location: Southern Ontario

PostPosted: Sun Jul 23, 2006 11:01 am    Post subject: Re: Pressure Signs Reply with quote

You know if your worried about high pressure just get a M1 Garand in testing they were rated for a 120,000 PSI proof load + being able to shoot after that. The proof load that would crack the bolt slightly still would be safe for 5,000 rounds or so Shocked

Dimitri

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